A lot of people build their own enclosures. I considered doing this but I'm really not handy at all and I had some specific ideas in mind that I knew I wouldn't be able to do on my own, so in the end I decided to have a custom built for me.
If you're interested, there are some vendors out there that will build a custom enclosure according to your specifications. I'd recommend checking to see if there are any local vendors that will do that for you so you don't have to worry about shipping. If you can't find any, a good resource would be a reptile expo if there are any coming up in your area. There are usually some vendors and pre-built custom enclosures available at those.
Alternatively, sometimes people post their custom enclosures on Craigslist. You can try there too, but if you go that route, make sure you thoroughly clean the enclosure before you put your beardie in it.