I saw one sell on Ebay for a reasonable $600 but have also seen a Strategy 500 sell for more. Just depends on the condition and economy. A used 20/20 can sell for more than a 50/50.
The Coliseum 300 Delivers Big Block Torque. Twelve 6L6s recreate all the heinous glory of two Triple Rectifier Solo Heads in one four space rack. Over 200 crushing watts of ugly attitude (per channel) keep high-gain crunch tight and focused even at volumes that are loud, Loud, LOUD. Tutored by SmartPowerTM, Half Drive tames this beast, making its wild horse-power more manageable. Combining Deep and Modern is the catalyst for recreating the explosive sound of the Triple Rec's Red Channel...the sickest sound in metal. Not a tool for the timid or faint-of-heart, the Power of Aggression gives it the Right to Rule and Crowns the 300 the King of Coliseum Crunch.
http://www.mesaboogie.com/Product_Info/Out_of%20_Production/Coliseum_300/coliseum_300.html
Also check page 3 in this link.
http://www.jedistar.com/pdf/Mesa%20Boogie%201999_reference_guide.-3.pdf
Ultimate in Mesa Boogie clean headroom for guitar. This power amp would run a wall of 4x12 cabs. ****, I need one.
Has to be heavier than a house though. My stage rig runs through an old Mesa power amp running 4 tubes per side at 95 watts. It is in its own 4 space rack and its like carrying a truck.
If you have a full stack or plan on getting one (or two) buy this amp!!!!!!