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USB.  I have no idea if the prices are crap or not, as I don't usually
deal in these items, but I can get them (no stock, may take a while).

BUFFALO AirStation Nfiniti Wireless-N High Power Compact USB 2.0
Adapter BUFFALO TECHNOLOGY (USA)
MFR# WLI-UC-G300HP  UPC/EAN# 747464118475
BUFFALO AirStation Nfiniti Wireless-N High Power Compact USB 2.0
Adapter - Network adapter - USB 2.0 - 802.11b, 802.11g, 802.11n
$38
http://cdn.cnetcontent.com/55/de/55deb3b3-5aaa-44e5-86d9-836caff452cf.jpg

StarTech.com USB 802.11N Dual Band Wireless Network Adapter - 300 Mbps
High Power 2T2R Wi-Fi 2.4/5GHz STARTECH.COM LTD.
MFR# USB300WN2X2D  UPC/EAN# 
StarTech.com USB 802.11N Dual Band Wireless Network Adapter - 300 Mbps
High Power 2T2R Wi-Fi 2.4/5GHz - Network adapter - USB 2.0 - 802.11b,
802.11a, 802.11g, 802.11n - black
$86
http://cdn.cnetcontent.com/52/da/52da574e-009a-45a4-b13b-a01fce37a335.jpg

That's some pretty mean antennae on the StartTech one.

Oh, I guess there's this PCI, but the "RangeMax" might just be
marketing, and not real higher power (looks cool though):

NETGEAR RangeMax Next Wireless PCI Adapter WN311B   
NETGEAR, INC.
MFR# WN311B-100NAS  UPC/EAN# 606449047189
NETGEAR RangeMax Next Wireless PCI Adapter WN311B - Network adapter -
PCI - 802.11b, 802.11g, 802.11n (draft) 
http://cdn.cnetcontent.com/15/2b/152b10e5-a025-4ef6-b927-15b177e2d4dd.jpg
$73

Also, for what it's worth, I find the $200-$350 access points are worth
every penny if you're wanting to do "weird" things like crazy range.
You look at the specs between a $300 and $50 WAP and wonder what you're
paying for, but I've sold so many of both and the $300 ones are simply
incredible.  They just work; they just don't drop & fail connections
like the cheap ones do.