No there are not elements which are too hard to come by my friend. Some effort is needed yes, but this is for the sake of the simple investment of energy. Here are two examples (I believe the only examples) of elements which you might consider “Hard to come by”.
The first example is for the Altar of Blackened Fire. It requires certain sympathetic elements to be placed within the urn such as grave dirt and human bone powder. These are available and affordable at Luciferian Apotheca if you can’t find them and not much is needed. The hardest element to find is soil taken from a tree which has been struck by lightening. This is needed because the soil is charged with the elemental power of Azi-Dahaka/Zohak the Three-Headed Dragon and Storm fiend. This “lightening charged soil” is what sends our sorcery through the veil for manifestation. It is charged with REAL tangible and physical power. It also represents the “Black Earth” and Ahrimans strategy to destroy the illusion of the tree of life. If there is no death… there is no life. There is only becoming and this takes knowledge.
The second is used within an alchemical rite which prepares one for the Rites of Envocation to obtain the Garb of Darkness. Envocation is reverse possession. Instead of the demon possessing us making our bodies vehicles for their power, we possess them making their spiritual consciousness vehicles for our will to expand consciousness to empower our counter creative efforts. To perform this alchemical initiation the essence of Ahriman is evoked according to tradition and he is asked to send forth a toad familiar to be sacrficed. The why and how is answered in the book itself. Trust me this has practical purpose.
The very bones of the toad become the bones of Angra Mainyu and they can be used for many sorcerous purposes, In this case you need to simply wait to encounter the animal. Then you have to catch the fucker. Lol! If one MUST, then a toad could be bought but it will take the edge of the focus and intent of the rite.
So my answer is simple. Elements are not impossible to obtain at all and it will not put you in the poor house. The investment is in effort regarding this current. Ahriman seeks to create real world change and to do that things have to be feasible and practical. A lot of this effort is in exercising creative power and this also is practical. “As above so below”… as you exercise your ability to create in an artistic fashion your spiritual power to create reality is enhanced. You become an artist of the life experience. One example of this artistic effort is the Circle of Counter-Creation. This is not something we could effectively sell because the process of creating it is what connects the sorcerer to the power. It cannot be put on cloth as having these seals placed in their proper sequence would lead to a permanent open door which is undesirable. Each seal is crafted by hand and they act as individual altars in and of themselves.