I am looking for easter eggs 2, 5, 7 and 8 in return of 5k gold and u may take upto 50 nixis for these 4 eggs

Hi, I don't currently have any Easter Eggs for sale, but since you're still newer, I thought I'd show you the Trade Broker(Clickable link), if you haven't gotten familiar with it yet.

In the Miscellaneous section for Type, is where you can find Easter Eggs for sale. So for example, if you were to scroll to the Miscellaneous section, you could put a 7 in the search bar and then press the blue Search Broker button, which would show you if there are any 7 Easter eggs, or anything else with the number 7 in the name, for sale.
With how the trade broker is set up, it'll show you from the Lowest to the Highest price, though you can also change these settings.

Also, a little tip, sending your pets on missions and unlocking all 6 mission slots will help you generate a nice income of gold that'll help you out a lot. ^^

I saw but each one is wayto costly

The price of the eggs likely went up since the Easter Event ended.
Since it ended, the Eggs can no longer be earned from the egg hunt or fighting enemies, so fewer eggs are circulating than they were during the event, thus causing the prices to go up.

As I mentioned, if you're struggling to make gold, you should do missions on a regular basis, using your best/highest-level pets for the missions. It's a huge help to have your missions going since you'll have a regular income of gold, which in turn will help you to afford the things you want and need. Such as the Easter Eggs or stable space, etc.

Here's a mission guide that may help you:

https://www.sylestia.com/forums/?thread=12841