It takes time, but you can almost always track down floorplans and specifications by going to the manufacturers' websites.
I started by going to (and bookmarking) 
RV Top Ten, which has a list of links to every RV company, and which brands they make.
I'm now going through and visiting each website. I add the manufacturer to my bookmarks, and sometimes even bookmark specific model pages, if they look to be within our length and weight window. Most sites also have a dealer locator, so you can visit dealers other than Lazy Days.
From browsing the web, it appears that at least some dealers will sell for 20-25% off of MSRP.