How to transfer my finished arduino to stripboard!

I've been looking for some Atmega328 chips but they cost about 6$...
If my program is small in size (4346 bytes) which atmega can i choose????
I am working on atmega328 but i want to know which are the other atmega chips that are exactly the same but they are smaller in size....
Please let me know....thank you....

and if you know a cheap online store to buy them!!!