I would try Brian at B&K Sales in Natick. I know he had a few Hi Points on his rack, and he handled the last couple of group buys. He may have some mags kicking around.
If you order them from Hi-Point you pay whats on the site. Shipping is free. Ask for a couple spare firing pins while your at it, in case yours gets bent. No charge for the parts.
Yeah i have called since and ordered a new stock 2 mags and mag clip for butt. Must say thier cs is awesome. I talk to Jim because this gun was totally worn out. I mailed him all the parts that were Peyton rusty and he is going to powder coat them for free in ship them back. A lot of the good manufacturers have great customer service but this is bar none
Got mine for 125 original 995 model soon to like new bought the stock upgrade. Was going to get original replaced but tech support says new stock buffers receiver wear better