Make sure you also have a way of mounting the binoculars that you buy, onto the tripod. There are various brackets for most of these "smaller" binoculars - from some dollars (plastic) to $30 or so.
I have to agree - the "sports" tag does not encourage me to think they would be the best for astronomy - ask the Bintel guys - but, hey, any binocular is going to be better than your eyes. But you may find you soon keep them only for daytime use and have to buy another if you want to see nebula, galaxies etc.
I haven't seen anyone seriously using less than 50mm aperture for astronomical work.
Good luck!
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