Hi, i know it might be too late to give an answer to it, but there are free and almos free mesh breasts for new people in sl
here are the links to some of them:
the firs one are not mesh breasts but enhances the aperance of them (free)
https://marketplace.secondlife.com/p/JJ-Portrait-Cleavage-Enhancer-Overflowing/6014848
these are actual mesh breasts (1 linden)
https://marketplace.secondlife.com/p/BB-Barbarella-Mesh-Started-breast-kit-1-week-promo/6024174
mes breasts and outfit ( the first link free, second link are 10 lindens)
http://maps.secondlife.com/secondlife/Skara%20Brae/237/239/1341
https://marketplace.secondlife.com/p/Lavarock-Industrie-Improved-Succubus-Starter-Kit/3406717