The first 10 volumes are plentiful and easy to find, so the prices are quite low. However, as you go into the higher volumes, there are a lot fewer of them around, so you can expect to pay quite a lot, if you're lucky enough to find them.
The airdates given in this list are taken from the packaging, and the packaging got some of them wrong. Also, in some cases, I wasn't able to find an actual box, so I can't provide airdates.
1 - Dinah Shore (Nov. 13, 1976), Roddy McDowall & Jackson 5 (Mar. 16, 1974)
2 - Ken Berry & Jack Weston (Oct. 20,1973), Rock Hudson & Steve Lawrence (Jan. 29, 1977)
3 - Carl Reiner (Jan. 19, 1974), Steve Lawrence (Jan. 10, 1970)
4 - Rock Hudson & Nancy Walker (Feb. 15, 1975), Roddy McDowall (Nov. 1, 1975)
5 - Jim Nabors (Sep. 25, 1976), Ken Berry & Carl Reiner (Dec. 14, 1974)
6 - Ken Berry (Mar. 26, 1977), Bernadette Peters (Feb. 16, 1974)
7 - Roddy McDowall & Bernadette Peters (Mar. 17, 1975), Betty White (Nov. 22, 1975)
8 - Sammy Davis Jr. (Sep. 20, 1975), Shirley Maclaine (Oct. 4, 1975)
9 - Steve Lawrence (Feb. 5, 1974), Steve Lawrence (Feb. 2, 1974)
10 - Lily Tomlin & Steve Lawrence (Nov. 8, 1972), Alan Alda (Dec. 21, 1974)
11 - Gloria Swanson (Sep. 29, 1973), Steve Lawrence & Paul Sand (Nov. 3, 1973)
12 - Dick Van Dyke & Tony Randall (Feb. 21, 1976), Roddy McDowall (Oct. 30, 1976)
13 - Roddy McDowall & Ken Berry (Jan. 8, 1978), The Regulars (Jan. 22, 1977)
14 - Hal Linden (Mar. 5, 1977), Eydie Gorme (Feb. 4, 1977)
15 - Steve Martin & Betty White (Mar. 5, 1978), James Garner & George Carlin & Ken Berry (Mar. 12, 1978)
16 - Pearl Bailey (Oct. 25, 1972), Eydie Gorme & Paul Sand (Oct. 13, 1973)
17 - Joel Grey & Vincent Price (Feb. 9, 1974), The Jackson 5 (Jan. 24, 1976)
18 - Eydie Gorme (Feb. 23, 1974), Joanne Woodward (Feb. 14, 1976)
19 - Madeline Kahn (no date), Ben Vereen (no date)
20 - Vincent Price & Joan Rivers (Jan. 4, 1975), Kay Cole (Nov. 6, 1976)
21 - Jim Nabors (Sep. 14, 1974), Telly Savalas & Smothers Brothers (Oct. 12, 1974)
22 - Tim Conway (Feb. 22, 1975), The Regulars (Mar. 19, 1976)
23 - Maggie Smith (Nov. 15, 1975), Betty White (Nov. 22, 1975)
24 - Cher (Sep. 27, 1975), Dick Van Dyke & Ken Berry (Oct. 29, 1977)
25 - Jack Klugman (Mar. 6, 1976), The Pointer Sisters (Nov. 29, 1975)
26 - Alan King (Dec. 4, 1976), Dick Van Dyke (Nov. 11, 1977)
27 - Maggie Smith (Nov. 24, 1974), Rita Moreno (Jan. 3, 1976)
28 - Petula Clark & Tim Conway (no date), Dick Van Dyke & Steve Lawrence (no date)
29 - Richard Crenna & Ruth Buzzi (Dec. 15, 1973), The Pointer Sisters (Oct. 25, 1975)
30 - Phil Silvers & Jean Stapleton (Mar. 29, 1975), Dick Van Dyke (Dec. 18, 1976)
31 - John Byner & Francine Beers (Mar. 23, 1974), William Conrad & the Jackson 5 (Jan. 25, 1975)
(UPDATE: In 2007, Guthy Renker began selling "The Carol Burnett Show" DVDs, through infomercials. The contents and volume numbers are identical to the Columbia House series. Only the artwork is different.)
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