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If you are looking for new razors I thing TI has some heavier grinds available as Dovo might too and Revisor has a couple of 6/8 NOS derbs/wedges in their rarities section. For used your best bet...

If you are looking at new razors in that size not much will be inexpensive, size costs. Even used blades that size range tend to be higher in cost than the 5/8 or 6/8 variety. Another possibility to...