Diy, 5 clutches will take up alot of room. Unless you wanted to buy more then one hovabator for example.
Maybe you can find like a mini fridge or something of that nature on craigslist or something and convert that.
I agree. DIY. Look for a wine cooler or mini fridge. If you have five large clutches, that will fill up a mini fridge. Luckily, they don't always come at the same time, so you probably will be fine. Always prepare for the worse case (5 very large clutches) and you won't have to worry. Be sure to prepare it ahead of time. You don't want to be scrambling at the last minute. Good luck!
You can pick up one of the larger Igloo coolers and turn it into an incubator. There are some out there that should be able to handle 5 clutches without an issue.
Make one, I'm sure you have enough room for a cooler. 1 clutch or 100 clutches, I will always say DIY, it's just too easy and you can make a high quality incubator if you try.