With only one missing card to complete the 1968 Topps set (N.Ryan RC), and everything since, this is the set that I'm now primarily focused on completing.
Along with the 1966 Topps set, these are some of the toughest high-number cards I've had to deal with. The early '70s sets from 1970-1972 had some pretty tough high-numbers, but 1966-1967 are in a different league. For final series cards, price guides are blatantly inaccurate. Using the grading scheme I've used in collecting all my cards to this point, you'd have the double the book values listed in the price guides to apply condition ratings to the pricing. Whereas, I'm used to finding low-grade cards for under 20% BV, good luck finding any of these for under 40% BV (adjust according to your own usual buying percentages).
Needless to say, I've been slow moving in completing this set although I'm down to the final series--except for the #150 Mickey Mantle card, of cours. One more card will put me at 90% completion, but with 61 currently missing cards, I actually expect to complete the 1962 and 1960 Topps sets before the 1967 Topps set is done (not necessarily cheaper; just more predictable pricing).
The 1967 set somewhat reminds me of the 1988 Topps set--especially if you combine 1966 with 1967. Packs were originally $0.05 for five cards, although 12-card cello packs and 36-card rack packs were also available (I don't know the prices). There were two major styles of wax pack wrappers with were both red, and depicted a players sliding with his knees bent. One wrapper advertised the insert set for the year, which was the 5" x 7" Topps Pin-up Posters, consisting of 32 different and highlighted by Mickey Mantle.