Are you in Austin? I stocked up at Walmart last year too, but they only had a couple of locations in town with any in stock. I think I finally went to the one at I-35 at SH-45.
Once again this year I found the white bevo frames with orange lights at the east bound 290 stop entering into Brenham. This is a flower and pottery store right before you get to the bypass turn on 290 to Houston.
They had two sizes. The large one was $175, the smaller $125. This was two weeks ago, so I don't know if any are left or if the price has dropped on unsold ones.