If u wanna get the best deals, always negotiate direct with providers not resellers, those margins can be huge. been burnt before thinking prices were fixed, turns out most are flexible if u ask. also, ask for bulk discounts early.
like i found that too, straight from the source u get better rates. last month i got a deal for 0.05 per GB, reseller was trying to charge 0.12 lol. gotta ask, ymmv.
last month i was digging into residential proxies and found that hitting up the provider directly saved me a good chunk, like i paid 0.04 per GB while resellers wanted double that. gotta remember tho, prices can still vary based on volume and demand, but direct talk usually gets u better deals lol.