Yes, for a variety of reasons. The new for 2017 crossbows are just hitting the shelves so sometimes they want to clear out the older models. Dealers will sometimes do this. Rarely at the box stores, though. Also, summer is a great time to get yourself familiar with your new bow and do a lot of shooting with it, before the hunting season.
Excalibur may add a new model every so often but the quality is always there. I switched to Excalibur going on 3 years now and since first sight in when I got it have not made one adjustment. I'm retired and hunted everyday of bow season in rain snow and warm weather dropped it,knocked it over more than once even had a dry fire. The dry fire was when it was new and still never had to adjust anything just wipe it down after a hunt and a little spray of wd40 in the trigger assembly after being out in the rain is all I ever do.
Some good advice so far. I would shoot as many as I could at varied shops, and make a choice based on what you really find appealing.
Also based on research done for reliability, warranty, and a shop who is attentive to your needs.
Looking at Arrowhead Outdoors website it looks like a pretty good place to start with if it's near you.
My best advice--Buy the best you can afford. There are some great crossbows out there to suit many different budgets.