Do you still sell the Evenflo Big Amp booster?

Hi Jen, thank you for your inquiry, The slim Big Amp Booster is no longer available, we do however have the Graco Turbo Highback Booster this has a width of 41cm this is currently the slimmest booster we have online. We hope this helps. if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.