wheelchairstrap.com

Very easy to use and customize, seriously impressive app. Options to have upsells on product pages and in-cart. You can apply an upsell to a specific product or a whole collection. Upsells can also be specific chosen products or tied to the "search and discovery" app. Integrates really well with the themes I use. Super fast and helpful customer service as well. I ran into a problem and Samuel was able to help solve my issue within the hour.