I did the Lash Perfect course and I loved it. I had also looked at the Marvel Lash course and although it was cheap they only have 3 lengths of lashes and in one thickness which personally I don't think is gonna help you.
If I was you, I would wait until you could maybe do a better course if the money is what's holding you back. I'm sure you'l benefit from it in the long run.
I honestly can't comment on the training or the products however, as I've never used them (just wanted to put that in so no Marvel Lash die-hards wanted to hit me!! :smack:!!)