c notch help

[spr85gmc]

I just started workin on the 5 lug swap on my 66 gmc using a 77 c10 I snagged up for 250.00. My question is where can I find a cnotch for it I have used the search button and came up with so many result figured it would just be easier to ask you guys myself. my plans asre to go as low as possible with bags and with a lot of mods to the bed. let me know where you all pick up your notches and about how much it set you back.......i went to a local shop (MWG)here guy wanted 800+ dollars for just building the notch.