You might consider getting a carry gun that is not similar in size to the shield that can be used as an alternative (for flexability) after you get your Shield.
Maybe a small pocket gun like the LCP. Having PM9 and LCP works well for me.
Ill echo what others have said about the PPS, great gun but I dislike the mag release. It is ambi-dexterous, but if you are left handed that might work for you.
Unless you have your heart set on a Shield, the Nano might be a option?
I recently bought a XDs (45), which I like a lot. I had my wife try it out, she liked it and had no issues with the tiny bit of added recoil, and she's not a hard core shooter.
Recently shot the Shield 9 & 40 at Shoot Straight gun range. Liked them both. They have them in stock.
OP - What is the issue with concealing your G19? Is it the thickness? Or is it the length of the grip?
If the latter, you can get a Glock G26, which is arguably the best CCW pistol out there, period. IIRC, about the same weight as the Shield, but holds 10+1...and will take the G19's 15-rd mags or the G17's 17-rd mags as a reload. Another option is getting your G19's grip shortened to take the G26's magazines - but that will take a bit of time to have done.
Note that some of the thinner 9mm's out there have grips that are as long (or longer) than your G19 - and the grip is what prints. Don't be too quickly seduced by "thinness."
If you want a lighter weight option, I would strongly suggest you look into a revolver. I have a Ruger LCR .38 Spl that I pocket carry daily, and after having gone 'round and 'round on the "pocket 9" merry-go-round, I could not be happier.
If you tell us how you intend to carry, you may get some more specific advice as well.
Good luck, and stay safe!
The Lakeland Shoot Straight has had the Shield in stock every time I've gone. I was real close to buying one when I was gun shopping last month, but after my disappointment with the LC9 I just couldn't bring myself to buy something I couldn't try first. Last night I went there for the range and they had the Shield advertised at $449 if I remember correctly.
The Casselberry and Apopka Shoot Straight both had shields in stock last weekend.
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If I didn't have my M&P Shield, I would continue to carry my Kahr CM9.
gun show in wichita falls today actually had a shield said they have been out for about two weeks and was surprised he hadn't sold it yet...price was 619...I would carry a sig p938 shoot one last week and was surprised at how snappy it felt (I mostly carry a g23 or sig p238) had a bersa and sold it didn't like the sights (go shoot a bounce of different guns find out what you like)....usually indoor ranges will have several options to shoot for a minimal colst rangemaster in texas is 16 to rent a gun 5 for each additional gun
I ask because I don't find IWB carry comfortable at all, no matter where I carry around the waist, or the thickness of the gun. Pocket carry works better for me, though I understand women's pockets are just too small in most cases.
In other words, try it before you plunk down the money for a single stack pistol, if you have not already done so.
None of the single stack 9mms out there really interest me. My luck with Kahr has been bad. The PPS has that funky mag release. The LC9 and Bersa BP9cc have mag disconnect safeties. The Shield has a thumb safety. The only one other than the Kahrs that has no thumb safety or mag disconnect safety is the Kel tec PF9, and their quality is somewhat spotty. Taurus has the 709, but again, their reputation is spotty - and it has a thumb safety IIRC.
Not sure what features you want, but if you want a "single stack Glock 19" (no thumb safety or mag disconnect, US-style mag release, DAO trigger) your choices are somewhat limited.
BTW - have you considered a revolver? They are thicker around the cylinder, but thinner everywhere else. Also lighter in weight, and more rounded, which can be more comfortable to carry IWB. Just a thought...
If you like the Shield, wait for it. Half the fun of getting a new carry is shopping for it. Keep checking Gunbroker and watch for it at other online stores and LGS. You will be surprised at how quickly you will find one at a reasonable price. 3 weeks ago I walked in a small mom and pop LGS and asked if they had one-half jokingly. The guy said sure-just came in this morning, $429. I had to take a closer look. It is a nice gun. If you get something else to "tide you over" until you find one you want, you won't be happy with it anyway and then you will have added costs for the trade transactions and depreciation. Not a Shield owner, but just my $.02.