There are dozens of models on Ebay. If you see one that's interesting and in your price range copy it's model number and search on youtube for it. There's bunches of people on there giving surprisingly good and educational reviews!
I have some old units but I really don't trust them and since you brought it up I think I need to up date my units. I did find this at Amazon a cheap dosimeter that would tell how much radiation you received.
You can get different items that have been tested to give off a predetermined amount of radiation and calibrate your meter accordingly. I learned about that and even how to do the calibration adjustments on Youtube! Even ebay has the test materials I believe.
The radiation levels near the site are way above acceptable limits but there is a lot of water between there and here. The levels in the waters off our shore are not higher than normal right now and that is well below the acceptable limit. We didn't get much airborne radiation because of the distance between the event and our shores - the same will be true for the water.