if you are really looking for some cheap and affordable coin to hold for long term then you are on right place. i am pretty sure that these currencies will blow up in 2018.
So here is the list.
dogecoin
verge
siacoin
bytecoin
status
dentacoin
electroneum
kin coin
funfair
reddcoin
iota
nxt
Burst
mooncoin
yoyocoin
Pepe Cash
Target Coin
i believe that by the end of this year doggecoin will be traded around 0.60$-1$. doggecoin start as a meme coin but now it has over 1 billion marketcap which is insane. the transaction fee is also very low as low as 0.01.
you can find more information about these currencies on various reddit.