Search your model on RV Trader or RVT to see what it can be had for elsewhere. Keep in mind there is a lot of regional price change due to transport cost (they are generally cheaper closer to the midwest where many/most are made). Decide how far you're willing to travel to pick up and/or if you want to buy locally for dealer support.
If nothing else, the low prices from elsewhere makes for a great negotiation tool.
A good deal is usually somewhere around 70% of MSRP. I just go for the lowest price I can get and buy the extras myself.