always keep an eye out on craigslist. i've found the majority of my kegs through craigslist.
also, a little bit of calling around may be able to get you some kegs. try calling the local pepsi and coke distributors and see if you can buy some kegs from them.
also, on ebay, a seller i know of who sells 4 kegs for 80 shipped every now and then is: dianah5331, they don't have any kegs listed right now, but they go up every now and then. recently they've only been pin lock though.
also, i believe you are referring to seller 'superlarry' for the kegs that went up in price. i think prices will only continue to rise, so if you can find cheap sources for decent kegs, get enough to hold you over... (i now have over 30 kegs)