If you (or a friend [emoji6] ) are okay at very basic DIY you could make one within your budget. Wood from a DIY store (or a builders/timber merchant) and mesh from eBayI'm also pretty sure making your own would be cost efficient and maybe in your budget.
We made our own run relatively cheaply, we used weldmesh bought from Amazon, use 16 or 19 guage mesh with small holes, don't buy one of those all metal barred runs as they are cheap but unsafe, rabbits have been known to get their head stuck between the bars. There's a warning thread on the housing sticky about them.
Do you mind if I ask what size and how much the run cost you.....and also what wood you used. I'm about to build my own