Off the shelf, cheap robots to test a group algorithm

I’ve developed a group behavior algorithm that I’ve tested in simulation, and I’m interested in testing it on some small ground robots (or flying ones). Is there any robot that I can buy which has some proximity sensors (IR, sonar) for <200 each. I'm plan to get about 5 to test out the algorithms. I prefer not to build my own as, that's not my strength.

submitted by /u/mackie__m
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