kino and borders price their mags decently. but actually if you subscribe, you save at least 50% off the cover price.
i've been subscribing to Guitar Player for a few years already. very worth it - articles are insightful, coverage is balanced, lessons are interesting. no tabs - but i'd consider it a great magazine for the "mature" guitarist - someone who's interested in going deeper into the instrument and guitar-driven music in general. got exposed to a lot of great guitarists and music thru this magazine. and the articles are very enduring - i can read my 10-year-old magazines and still derive fresh insights and ideas.
the UK mags tend to be more ex cos of the exchange rate i reckon. but total guitar, guitar techniques and guitarist are pretty good. i buy guitarist from time to time, if there are interesting articles. the UK writing style is very candid, so makes their interviews and reviews more personal rather than hyperbolic - as some US mags can get sometimes. only trouble is that they are a bit ex so i don't buy them so often.