I think that in your area, there are a lot of pinball games for sale and at prices a lot less than one see's in California.
So while the games for sale near you might not be newer, you have to compete with a lot of really good older titles.
I think that's what might make it difficult for you.
You might offer to ship palleted, if you don't already...perhaps at a low or at no additional cost, other than the shipping charge it's self, which the buyer can arrange.
Robert