Cantillion is fantastic, but it definitely hurts the pocketbook. The Lady of the House recently got a St. Lamvinus (rare even for Cantillion) for her birthday and it was glorious. It definitely benefits from proper serving temperature - starts very sour (more tart than vinegar) and it finishes like a nice red wine. Thankfully it had enough complexity that I wasn't tempted to take big gulps.
You can find it online if your state allows that.
Cantillon Saint Lamvinus - ZYN.ca, your specialty online liquor store for example. Ours was purchased from a Washington, DC grey market vendor.