Yes, the clip on is how our chefs have done ours here (but now have a real
sealer).
I paid $65 for my sousvide circulator. And vac sealers do not have to be that expensive. I have my 3rd (in about30 years) and have had the original, then one with lots of bells and whistles, and am now back to plain pipe rack which does the job just fine. SO, I REAlLY recommend a vac sealer for lots more than sous vide, and I think you can get one for $50 if you shop.
;o)