Hope this is OK to post.
I stumbled across what seems to be a pretty good deal on EverFlo O2 concentrators. US Oxygen Sales for a very limited time (sale may end today) is offering new EverFlo Q's for $595 with free shipping. You have to call to get the price, act quickly if you are interested.
I've been looking into purchasing a concentrator for awhile, once my family's deductible resets in January the noisy piece of junk perpetual rental we have from the DME will start costing me over $100 a month. For my family buying out of pocket will save us money in the long run, I figure others on this forum may be in the same boat.