Olivia. The cost to buy wooden is a little more than building your own. By the time you factor time, fuel, and effort I think it is cheaper to buy it all precut and just assemble. There are a few things that I do build because I have customized them to meet my needs and desires. I build the Screened bottom boards, ventilated inner covers and I make the tops. I make some fancy top covers, that have copper shingle roofs and trim. As for me I have 5 hives, gonna add five more this spring, been in it for 8-9 years now I think. I do it just for the fun and enjoyment I get out of it. My 3 y/o grand daughter is hooked on bees and honey and loves to help me work the bee's. That in itself offsets any costs I may incur.
Have fun with your new bee's!