Well, if you want to get in ML for $70, I suggest just keeping the $70. and go shoot with someone & ya don't have to spend anything & save a trip to WalMart......? I really don't know how you could possibly get a ML any cheaper than $70. or at least one that will function at all & not totally piss ya off all the time. Oh well, you may find one a buck or two cheaper across town but then it may cost more in gasoline & hassle than the savings.
Also you might want to keep in mind that you will spend another $100 min. on all the other stuff ya need for the rifle....
Normal start up on a decent ML is about $400.-500 for a decent mass produced rifle & bare essentials, such as a Lyman GPR and the min. stuff ya need to go with it. Some will say that is B.S., but you just keep an accurate Written record for about 6 mo. & see. This will give ya a decent rifle to shoot target & hunt with.... Also if you decide to sell the GPR later you can easily do so & recoup 75% of your investment if you take care of the rifle.
I did have a .50 Bobcat here one time I had won someplace & I shot it & it would put 3 PRB's in a 2" circle at 50 yards, which surprised me.