Alright. I've gotten many comments on this in the past. My sizes were hard to have printed and find frames for, which I can totally agree with.
They weren't the best, and I'm not entirely sure why I chose those sizes to start with, but there they were.

I've been testing my computer recently to see exactly what it could handle, and what it cannot. I know that it can't possibly handle the largest sizes of posters, but it can go up to a decent size with a bit of effort. s
Soo... I've decided that I will change my sizes for large commissions to standard poster sizes. 8.5 x11 through 18x24 inches. These will still be at 300 DPI. Should be much easier to find printers and frames for these sizes guys, so you no longer have to go searching high and low for crazily sized frames.

This also means that prices will change to match said sizes and difficulty with creating artwork for those sizes.

I found with the last two large commissions that I'd severely underestimated work time for them. x_X
Anyhow, they're a great learning experience, and I feel much better prepared for future work.