Step 1: Get a job
Step 2: Budget money appropriately
easier said than done xD
choose which one you like better. you will save up money for other story eventually. they always do reprints for popular ones.
You could buy the series which is shorter first because then you can get to the series which is longer or you can buy the longer series so it is finished first. Especially with Hidoku Shinaide there will be lots of sequels it might be a bit difficult to aquire them all. It really depends on what you want more :3
I've always had good luck with Amazon as far a cheaper list prices go. They usually print in English there too. You can buy them slightly used for an even lower price too!
(๑•ㅂ•)و✧
I want to get physical copies of BL manga when I'm 18, but I don't want to be broke after I do. I really want to buy the Ten Count series and the Hidoku Shinaide series but after that I only want to buy about 5 volumes of some other series. Which should I buy?