This prevent me to buy lamps and ballasts from there.

That’s just the way it is, Dor.

That's just the cost to move that thing from where it is to you, not much you can change, other than the postage service...

E-Bay combines finding, paying/money transfer, shipping and even some insurance in one convenient package, just a few mouseclicks actually. That allows them to charge an inflated monopolistic price for their service. You can of course do more homework yourself and save a lot with some less known forwarder/shipper etc.

The main thing is that eBay provides a almost global platform for buying and selling, and for that alone they take a 30% cut. There are cheaper more regional alternatives but you'll need to do a lot more work, or take on more risk.

For example Facebook Marketplace dosen't take a cut but it only designed for in person transactions so there's no built in payment or shipping. You can however make arrangements to ask the seller to ship but if anything goes wrong you have no recourse.

Anyway I found the best way to get around high shipping prices is to just use a forwarder with eBay. It works for US to Canada but for other's you'll have to do your own homework.