As others have said especially given that you aren't in a hurry I would keep my eyes open on CL.
But also keep in mind that all dump trailers are not created equally. It seems the older they are, assuming they are in good shape the better they are. I picked up essentially a brand new one off CL for $50. It was not nearly as solid as my father's Agri-Fab that he had for years but said wth it'll fine for my needs.
Well, shortly after using it it started flexing and literally falling apart. I bent the **** out of it one time trying to dump with it and decided I had enough of the POS. I fixed the dents with a hammer and block of wood and threw it up on CL for $60 figuring I would try and get my money back. A guy came looked at it handed me 60 bucks and said it would be perfect for him. I told him it was flimsy but he didnt seem to concerned. So I made $10 on that somehow after destroying it and kept my eyes out for a more solid one. Sure enough a solid Agri-Fab popped up looked mint and I got it for $75 and was a happy camper. It is so much more heavy duty than the other POS I had.
Moral of the story keep your eyes open on CL but be sure to get one that feels solid. If it feels flimsy it is and it wont last. I dont know the quality of the HF one, maybe it is fine but there are deals to be had on CL so if youre patient you'll find one that fits your needs. Oh and a utility trailer is way better than using a wheelbarrow.