Those who recite the LOTH may not know that there is a 2-year lectionary in addition to the 1-year lectionary that is included in the 4-volume set. If you look in the indices of the LOTH you’ll see the scripture references for the 2-year lectionary.
For those who have the 1-volume Christian Prayer, it is thus possible to stick with it and use the 2-year lectionary.
I found this source for it, on-line, in MS Word format:
2-year lectionary
You could theoretically download it and use it along with your 1-volume Christian Prayer, to fully pray the Office of Readings. As a bonus you’ll be getting a much richer cycle of readings than is present in the 4-volume LOTH
And it is fully licit, and a heck of a lot cheaper than the 4-volume set.
Missing will be the responsories. But that’s not so bad. The rubrics of the LOTH allow one to replace the responsories with a period of silence in private recitation; in fact responsories don’t make a heck of a lot of sense in private recitation, you’re responding to yourself!
I use the 2-year lectionary, but a Latin/French version (I do the LOTH in Latin for Lauds and Vespers, and French for the rest).