Amazon has the Gazillion Bubbles Portable Bubble Maker (https://www.amazon.com/dp/B07H5TCKB5?tag=quackdeals-20) for just $5.68 (originally $22). Free shipping with Prime or on $35+ orders. This bubble machine includes 8 oz. of solution and boasts decent ratings with steady recent sales.
(https://m.media-amazon.com/images/I/61uHrjFAUgL._AC_SL1500_.jpg)