If you want a somewhat portable laptop you better go ITX. (If you don't know what it is google it or you can always inbox me.)
But if you really prefer a gaming laptop I sugges you check on several you find on stores like Walmart, K-Mart or those kind that don't specialize in electronics and usually don't sell them a lot. If you are lucky you will get a huge discount out of them just because they want to get rid of it.
But if you want to build a somewhst portable PC I can help you with that. You would still have to pack and buy a keyboard, headphones and mouse not ti mention the monitor. Which is the biggest issue.