As the name suggests, Martinique's national cocktail is deliciously punchy – traditionally made with 50% alc./vol. rhum agricole. And, even if you choose...
This is my husband's go-to when we vacation on St Martin/Sint Maarten. It's really difficult to duplicate 1:1 when we get home (we live in the US) but LeBlon Cachaca is about as close as we can get in PA to the real agricultural grade rum they use on the island. We do bring some agri grade rum home sometimes but otherwise, this drink is a wonderful reminder of our vacation time.
I'm not sure what's available in PA, but some other options are Rhum J.M. Blanc, La Favorite, or Neisson.
I am in OH, we have pretty poor distribution to state stores as well, but at least I can ship to my house from out of state.
Other commenters are talking about Haitian clairins, which - while not traditional for ti' punch - are similar in profile to rhum agricole, and also make a fantastic ti' punch. As does Rhum Barbancourt Haitian Proof (55% Haitian blanc), which again is different, but similar.
We can get some varieties of Barbancourt in PA, believe it or not. I've made my husband a ti punch with one of the higher proof Barbancourts. It was quite tasty. Appreciate the other suggestions though - will have to keep an eye out for them. Thanks!
Thanks for the tip - I checked on the website but it's not available in the PA liquor stores. Perhaps we could find that brand in Maryland or New Jersey, or I can also check online for a stateside distributor. Pennsylvania is a difficult state for spirits - they are limited in what they will import or allow to be imported to private homes. That being said, having the name of a good substitute for Trois Rivieres that they frequently use on the island is awesome - thank you!!!