I can understand being on a budget.
However, do not be afraid to invest in a quality air rifle. Many people think that because it's a "BB"-gun, spending more than X-amount for them is stupid. Nothing could be further from the truth. I own many firearms of all types, and can tell you that my German made spring-piston air rifles and pistols are some of my most cherished and used.
Take a look at the Beeman line. Maybe something like the R-7 in .177 with standard stock.
http://www.beeman.com/r7.htmLightweight, low cocking effort, excellent accuracy, good power, German made.
You can find them for around $270.00.
Yes, I know that's more than double your stated price range. Just throwing some options at ya.
Hell, we've ALL spent more on guns than we intended, haven't we?
Jim :-D
:-D