I do prefer the curved baseplate. It's more comfortable for range use and I don't normally carry my all-metal 3rd Gens. If I did, I'd want the flat baseplate. Right now, MidwayUSA is out of the curved baseplates even as an option. Numrich has the curved baseplates in stock, but the price is a little steep, especially considering shipping.

As you point out, MidwayUSA is out and Greg Cote has only 5 left. My problem with Greg Cote is his flat shipping fee of $6.95. Makes buying one or two magazines at a time very expensive for an old, retired poverty case like me. At least with MidwayUSA, I can combine the magazines with other parts & stuff I need from them and the shipping fee is usually just $4.95 anyway.

As you can probably tell, I am extremely cost sensitive... so it's not just a matter of finding the magazines. It's a matter of not over-paying for them as well.