Here most DS games RRP at £30 ($46.92), with budget ones like Brain Training at £20 ($31.29).  Most games fall in price fairly quickly, but the 'evergreen' titles such as Mario Kart stay at that price for several years.  At release, some retailers put up prices, on the DS it happened with the most recent Layton, which was put up to £33 ($51.60) and on the Wii it happened to DKCR, which was put up to £42 (£65.68).  And some, but not all, 360/PS3 games start at £50 ($78.19)

I imagine most 3DS games retailing in the U.K for £35 ($54.73), with some high profile releases being temporarily higher and budget releases considerably lower.

Oh, and these were last years prices, earlier this month Value Added Tax went up to 20%, so that might have a small, minuscule effect on prices. 

Well, considering that the dollar has been sucking hard for the last half year, i wouldn't be so surprised to see prices hike up with the 3DS.

I expect most games to be $39.99.  Smaller scale and "budget" games around launch (like SSF4, Puzzle Bobble, Monkey Ball, etc) will probably be $34.99.  I think all the 1st party games will come in around $34.99 too.

40 is okay but higher than that would be crazy.

$30 - $50 was what i expected, so its not too disconcerting