When I looked on eBay and Aliexpress, I found these, among others:Yikes: the lead time for the LTC6820 part is now 2023Q2! I've got QTY90 of them. Each LiBCM requires QTY1. I suspect I'll end up pulling the QTY11 that are on the alpha/beta units.

LTC6820IMS LTC6820HMS LTC6820 MSOP | eBay
We will send it within3-5. For example, as the price, we should write on the waybill invoice, or how to describe the goods, and so on.
www.ebay.com

33.25US $ 5% OFF|10Pcs LTC6820IMS LTC6820HMS LTC6820 LT6820 6820 MSOP in stock 100% new and original|Replacement Parts & Accessories| - AliExpress
Smarter Shopping, Better Living! Aliexpress.com
Any reason these wouldn't work?