Kerr and Ball both make plastic lids that fit on mason jars. Lone Star Candle Supplies makes plastic lids for use on jar candles.
The plastic canning lids from Ball and Kerr are dishwasher-safe and are for use on any standard glass preserving jar. Simply screw them into place and freeze food or store in the refrigerator or pantry. The lids are also BPA-free. The lids are not for use in heat processing.
Lone Star Candle Supplies makes four different types of lids, including large and small square lids and large and small round lids. The square lids fit specific candle sizes, while the round lids fit a variety of sizes.