About $250, where at?
Most of the places I've checked into have the Sirius receiver for $149 or less and this normally includes the car kit, then the boombox kit for home use seems to be around $100, XM can be set up for slightly less, I was looking at one receiver (XM) yesterday for $129 and there is another model for $100, but it just depends on which receiver you go with, there are several on the market for both services.
It seems you don't have to buy the boombox, the basic receivers incorporate a FM modulator that sends the signal to any FM receiver using a variety of seldom used frequencys that you can choose from.
I just seen in the Best Buy ad this morning that XM has a walkman out call Mi-Fi, the kit includes the walkman, home kit and car kit for $350, I'm pretty sure Sirius won't be far behind, I may wait a while longer because I listen to a walkman at work and that would be perfect, I'm not sure how well the reception would be considering all the steel beams my work area is surrounded by.
Both Sirius and XM have the traffic stations for major cities, I read an article this morning in the paper on satellite radio, it comes down to your preference of programming which service you go with, both are basically similar with a few very specific differences that would tend to sway someones decision (Nascar or NFL for example), the article went on to say that sat-radio will continue to grow in popularity as prices come down and programming choices expand, and yes I guess some stations do still have ads, but at least there are a 100+ stations to surf between to avoid the annoying things, and many stations play uncensored music which is a big deal to me, I hate censorship.