I was planning to go with the G-Code INCOG holster since I have one for my G19 and really like them. However, when I tried to order the website wouldn't take any of my cards. I contacted customer service they basically told me I was the problem and then brushed me off. So since they don't want my business I'm looking for recommendations for an alternative IWB holster for my Glock 48. Hit me with your recommendations...

Talk to Tony at JM Custom Kydex, he's very helpfully for what works for different body types, carry preferences etc.
I use his Wing Claw 2.0 with a wedge for a 365XL or P10C daily, most comfortable set up I've found by far, build quality and customer service are top notch.

I buy my holsters from a Texas company (since I see that you are from TX) www.patriotholsters.net.  They take a while but they are all hand made to your order and the quality is beyond any other that I have seen for Kydex holsters.  Check them out.

NSR Tactical

Tenicor for AIWB for me.