Go to freecycle.com and see if your area has a group. Also post on craigslist. Just last week i got a full height single pane fridge and a half size for free from both of those sites. So if you can find a fridge, which you can with some digging, then you only need to buy a thermo, flexwatt, fan, and backup thermo. Thats less than you pay for an incubator and you can fit a whole lot more clutches. Goodluck!

Edit** forgot to mention, post your ads as "wanted: BROKEN glass front fridge/cooler". When you mention broken people are just happy for you to come take their trash. The compressors on these things die all the time and they are a hazardous waste so its not very easy to get rid of them.