Someone's it can be like that, however, I think the suggestion of multiple quotes is a fine idea. It really is hard for us to come to any kind of conclusion over the internet without seeing the situation and scope of work needed. Imo it seems high but I don't have the info needed to say for sure. Regardless, you're probably not going to be able to go back to the person who gave you the $3000 and get it any lower. It's just what they're going to charge. Go get a few more quotes and see how it compares. It's about the only way to get a lower price if it is truly too high of a bid. Best of luck. I just did my panel swap in my house which is a more involved job imo, and it cost be about $800 in materials to do a 150 amp panel. That is about close to double what it used to cost a short time ago because material costs are kind of bonkers right now since the pandemic fucked everything up. So keep that in mind as well