If you look on the page, they have the link to Paraclete Press for the same CDs, and they have a discount on the complete set. I own at least 7 of them, and yeah, they're good, and worth the money.
Off hand, here are 3 vespers recordings, various in their approach to chant:
1) Vespers & Compline - Solesmes - Dom Jean Claire, Choirmaster - [ available from Paraclete ]
2) Gregorian Chant: Ist Vespers for Nat. of the BVM - King's College - Stephen Cleobury, Choirmaster - [ EMI Classics ]
3) Compostela ad Vesperas Sancti Iacobi - Ensemble Organum - Marcel Peres, Choirmaster - [ Ambrosie ]
Here are a couple more:
1) (This is an interesting comparison of Vespers & Evensong)
Evensong & Vespers at Kings' - Vespers for Feast of the BVM
Evensong for Advent
Choir of King's College, Cambridge
Stephen Cleobury, Choirmaster
[ Columns Classics]
2) Ad Vesperas Sancti Ludovice Regis Franciae (from the Antiphonaire des Invalides, 1682) -
Ensemble Organum
Marcel Peres, Choirmaster
Here is another, quite interesting, one:
Le manuscrit du Puy:
L'office du Nouvel An a la Cathedral du Puy-en-Velay, XIIme-XVIme siecles
Ensemble Gilles Banchois
Dominique Vellard, Choirmaster
[ Virgin Classics ]
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