For now, anyway, this seems to be available at Amazon:
Radioactive sample of uranium ore. Useful for testing Geiger Counters. License exempt. Uranium ore sample sizes vary. Shipped in labeled metal container as shown. Shipping Information: We are always in compliance with Section 13 from part 40 of the NRC Nuclear Regulatory Commission rules and regulations and Postal Service regulations specified in 49 CFR 173.421 for activity limits of low level radioactive materials. Item will be shipped in accordance with Postal Service activity limits specified in Publication 52. Radioactive minerals are for educational and scientific use only.
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