Wireless Access Point with Port/Packet filtering support

Hi.

I am trying to find an access point with port/packet filtering which
costs less than $100.

Is it possible to use those cheap wireless routers, they all offer
port/packet filtering, in an access point *only* setup? (I personally
doubt this.)

I do NOT want/need MAC filtering - I need port/packet filtering. I
also doubt that any of those wireless routers will still do their
port/packet filtering once u turn their router part/function off ... .

The only AP for $200 which does this is the Proxim/Orinoco AP-200, but
that is the old 11Mbit variety.

Does anybody know about a relat. new AP < $100 works for this?

Thanks!