It’s probably a tad over the budget but the Ordonez Malaga #1, is fantastic for the price and probably distributed and available in that volume in MA. It’s usually about $15 a half, so maybe at a multiple case buy you could come close. Still won’t get it to $10.
Quady Electra should be about $15 for a 750. That is lower alcohol and more wine-like too so it can be refreshing and not heavy. Careful there is a white and a red.
BV (Beaulieu Vineyards) makes a Beaumes de Venise-styled wine called “Muscat de Beaulieu”. Costs about $8 for a .375. I think Mondavi still does one too.
Another Beaumes de Venise-styled French product is St. Jean de Minervois Muscat .375ml. Imported by Pasternak. About $12.
I was definitely thinking moscato d’asti, and you should be able to find something in range. I’ve yet to find a poor one, so pretty reliable IMO. It also should still appeal to wine enthusiasts as it carries the acidity that many cheap sweeties lack. The low alc% is also definitely worth thinking about for wedding guests who may have to drive home. Even something that a parent might feel ok to let a child have a small glass of / taste of.
It is remarkably good with chocolate / chocolate desserts if that is on the menu.
Moscato sounds good to me if you have to have a sweet wine at that point.
The last thing you want with most desserts is a classic dessert wine – Sauternes, Coteau du Layon or Auslese. They just fight each other. Unless the dessert isn’t very sweet, its better to go with something fortified or much lower in alcohol but fizzy, like the Moscato, so there’s a contrast with the sweetness of the dessert.