Some good 1.25" 2x barlows
You can't go wrong with a Celestron Ultima, IMHO and they're common enough and old enough that there's tidy used ones around for less than $100. Many seem to like the Orion Shorty too - same vintage and price - although I haven't personally tried one. I've heard TeleVue's Barlow praised also, but they don't seem to be all that common - I think most people go for the T-V Powermates instead.
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