FYI - Discatcher Sport has 18 strands of chain in a single row (I have one), like it a lot.
Chain length is 25.5" each. I agree, pricing is usually $0.75 - $1 /ft for the chain (highly recommend bringing one of the rusty ones, DO NOT get chain that is too light (only slightly cheaper), it will catch like garbage)
So napkin math, based on 80 cents/foot if you skimp to 2' each (maybe 1 link less)(I'm a basket geek and changing a link or two really changes the shape of the chain, anyway...) that's $28.80 + tax for a single row of chain, and $57.60 + tax for double set of chains.
If you are looking for a good deal, I don't think that you're looking to buy $60 worth of chain, maybe i'm wrong. Here's what i'd do -
Single Row Outer Chain - Catches well, does what it's designed for. Maybe some cut throughs, but honestly, you're looking for a practice basket to throw at, and maybe bring out to add to Ace Races, Etc. Use 1 row of chains... If you add inner chain, maybe add 6 inner ones, every third spoke...
You want inner chains only (bulls eye basket) for hard core practice putting. I like it! Tip - the basket has 18 spokes that come out from the center, and there's a circle thing on top. If you keep the S-hooks open, instead of taking the chain off the S-hook, take the S-hook off the basket, and move the S-hook and dangling chain and hook it on the middle of the spoke, and they'll slide in to the metal circle thing, maybe 10" total width. You could also add a zip tie to each spoke and widen out the top a bit, with the zip tie keeping the chains from sliding all the way in.
Post a Picture of what you come up with!!