So far, after calling just about everywhere, here's what I've found.
1) Most big named places (Home Depot, Lowes) only carry up to 5/16" chains.
2) Most big named Marina places (search anchor chains) do NOT carry 5/8" because it's too small LOL.
3) I've only found one store in my immediate area that can cut me 5/16" chains and it'll cost me $110 for two 5 ft lengths. But I'd also need additional chain to attach the 5/16's to so I can do my lower days (ie box squats) with them as well as speed bench. So perhaps it's a wash with APT since they also offer carabiners (sp) and additional chain. Plus they have a 20% off sale, so that'll knock out shipping.
OR, perhaps I'm not looking at this right. Perhaps when I hit up OCSC today, I can make an offer since they got enough chain to wrap around the globe.... Twice.
I figure every other payday (once a month), I can invest in something. Protein from TP every two weeks, APT every two weeks. I'm looking to pick up a true dragging sled with nylon straps from Scott (sandblaster) so I can start upper body work. Then it's on to monster mini's and average bands, then chains.