Comperable air rifle to Marksman Biathlon?

I am looking to buy an air rifle for my 10 yr. old. After shooting the Biathlon at Boy Scout camp and talking with some shooters and your web site I felt confident this was an affordable and good choice for an entry level air rifle. The only problem it turns out is that Marksman no longer makes them. I called Marksman and they recommended the Beeman Silver Bear as comparable. it's a $90 gun which is a bit too high for entry level pricing.

Do you have a recommendation for an air rifle comparable to the Biathlon?

Thanks for any help.