ShopifyWorks is a Toronto-based shopify development shop. You can see our work at shopifyworks.com. We pride ourselves on excellent support. You will talk to someone who speaks proper English and we are always available on phone and email. We try to respond to emails within 1 hour.
Moving on to the proposal, in the interest of fairness and honesty, we must tell you that continuous scrolling instead of pagination for shopify is a "solved problem". Solutions already exist out there that are robust, tested and "battle-ready" so to speak. And used by thousand of shops and vetted by the shopify community.
This is why we have gone with a low bid. We will not be re-inventing the wheel here. Reason why you don't want that is because any solution, when implemented for the first time will have bugs and quirks of its own. By using a solution that is tried and tested, we are providing you something that has all its bugs ironed out. It won't stutter or stop working.
What we're charging you is for tailoring it for your particular theme and making any adjustments that you would like. Also, you will receive the best support a dev shop could provide. Lastly, we will also throw in a 6-month free support for any changes (within reason) . With ShopifyWorks you will have the peace of mind and the confidence that it'll just work.
We understand we are a new shop on freelance, but give us a call and you'll find out why you've made a great choice.