Reasonably priced places to hit a tennis ball

Does anyone know a reasonably priced, low hassle place to play tennis in Tokyo? I realise a lot of the wards have facilities and there is Ariake Tennis no Mori in Odaiba - which seems to have decent prices - but they all seem to require booking about 2 months in advance.

Now, here’s a bit of an odd question but do you want to play against anyone or just on your own? Reason I mention is that if you are the “hitting against a wall sort” there’s this curved wall that appears to be free (well, at least from what I’ve seen) that seems to attract tennis fans near Harajuku.

〒151-0051 東京都渋谷区千駄ヶ谷1丁目 外苑西通りの付近