What would be a reasonable price for a username?

How much would people pay for an “original” Instagram username. Like for example: @reddit or @dogs

[Im using those as examples. Those are not my accounts and in no way promoting them]

submitted by /u/raixuz
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Andy Nguyễn Group - mua bán fanpage facebook, mua bán group facebook, thuê group facebook, đổi tên fanpage, tăng like fanpage, mua like fanpage, bảo mật facebook, xác minh google maps, mua fanpage ad breaks
Website : mua fanpage
Hotline : 0977099016
Địa chỉ : 1185/5/1A Lê Văn Lương - Phước Kiển - Nhà Bè - HCM